Update READ_COMMITTED_SNAPSHOT migration
Update READ_COMMITTED_SNAPSHOT migration

Change it so it doesn't wait for other open transactions.
Don't run this change itself inside a transaction, and tell Liquibase to run it each time the checksum changes (like now).

NCI-Agency/anet,NCI-Agency/anet,NCI-Agency/anet,NCI-Agency/anet,NCI-Agency/anet